How do you add the reviewing toolbar if it does not appear by default when you turn on track changes?

The two main features of the Reviewing Toolbar (RT) are the "Comment" and "Track Change" feature. With these, you can make comments and changes to a document, and then give the reader the option of accepting or rejecting them.
Using the RT  is the most economical way to edit a document. If it is does not appear by default you can turn it on.
There are three possible ways how to do that:

1. View>Toolbar>Reviewing
2. Right click on any Toolbar> Reviewing
3. Double click on TRK  in the Status Bar 

The answer is b; as a lab tech, you’re more behind the scenes and don’t interact with the patients.